+++ /dev/null
-
-/* Copyright (c) Mark J. Kilgard, 1994. */
-
-/**
- * (c) Copyright 1993, Silicon Graphics, Inc.
- * ALL RIGHTS RESERVED
- * Permission to use, copy, modify, and distribute this software for
- * any purpose and without fee is hereby granted, provided that the above
- * copyright notice appear in all copies and that both the copyright notice
- * and this permission notice appear in supporting documentation, and that
- * the name of Silicon Graphics, Inc. not be used in advertising
- * or publicity pertaining to distribution of the software without specific,
- * written prior permission.
- *
- * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
- * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
- * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
- * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
- * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
- * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
- * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
- * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
- * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
- * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * US Government Users Restricted Rights
- * Use, duplication, or disclosure by the Government is subject to
- * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
- * (c)(1)(ii) of the Rights in Technical Data and Computer Software
- * clause at DFARS 252.227-7013 and/or in similar or successor
- * clauses in the FAR or the DOD or NASA FAR Supplement.
- * Unpublished-- rights reserved under the copyright laws of the
- * United States. Contractor/manufacturer is Silicon Graphics,
- * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
- *
- * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
- */
-/*
- * fog.c
- * This program draws 5 red teapots, each at a different
- * z distance from the eye, in different types of fog.
- * Pressing the left mouse button chooses between 3 types of
- * fog: exponential, exponential squared, and linear.
- * In this program, there is a fixed density value, as well
- * as fixed start and end values for the linear fog.
- */
-#include <stdlib.h>
-#include <math.h>
-#include <GL/glut.h>
-
-GLint fogMode;
-
-static void
-selectFog(int mode)
-{
- switch(mode) {
- case GL_LINEAR:
- glFogf(GL_FOG_START, 1.0);
- glFogf(GL_FOG_END, 5.0);
- /* falls through */
- case GL_EXP2:
- case GL_EXP:
- glFogi(GL_FOG_MODE, mode);
- glutPostRedisplay();
- break;
- case 0:
- exit(0);
- }
-}
-
-/* Initialize z-buffer, projection matrix, light source,
- * and lighting model. Do not specify a material property here.
- */
-static void
-myinit(void)
-{
- GLfloat position[] =
- {0.0, 3.0, 3.0, 0.0};
- GLfloat local_view[] =
- {0.0};
-
- glEnable(GL_DEPTH_TEST);
- glDepthFunc(GL_LESS);
-
- glLightfv(GL_LIGHT0, GL_POSITION, position);
- glLightModelfv(GL_LIGHT_MODEL_LOCAL_VIEWER, local_view);
-
- glFrontFace(GL_CW);
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- glEnable(GL_AUTO_NORMAL);
- glEnable(GL_NORMALIZE);
- glEnable(GL_FOG);
- {
- GLfloat fogColor[4] =
- {0.5, 0.5, 0.5, 1.0};
-
- fogMode = GL_EXP;
- glFogi(GL_FOG_MODE, fogMode);
- glFogfv(GL_FOG_COLOR, fogColor);
- glFogf(GL_FOG_DENSITY, 0.35);
- glHint(GL_FOG_HINT, GL_DONT_CARE);
- glClearColor(0.5, 0.5, 0.5, 1.0);
- }
-}
-
-static void
-renderRedTeapot(GLfloat x, GLfloat y, GLfloat z)
-{
- float mat[4];
-
- glPushMatrix();
- glTranslatef(x, y, z);
- mat[0] = 0.1745;
- mat[1] = 0.01175;
- mat[2] = 0.01175;
- mat[3] = 1.0;
- glMaterialfv(GL_FRONT, GL_AMBIENT, mat);
- mat[0] = 0.61424;
- mat[1] = 0.04136;
- mat[2] = 0.04136;
- glMaterialfv(GL_FRONT, GL_DIFFUSE, mat);
- mat[0] = 0.727811;
- mat[1] = 0.626959;
- mat[2] = 0.626959;
- glMaterialfv(GL_FRONT, GL_SPECULAR, mat);
- glMaterialf(GL_FRONT, GL_SHININESS, 0.6 * 128.0);
- glutSolidTeapot(1.0);
- glPopMatrix();
-}
-
-/* display() draws 5 teapots at different z positions.
- */
-static void
-display(void)
-{
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- renderRedTeapot(-4.0, -0.5, -1.0);
- renderRedTeapot(-2.0, -0.5, -2.0);
- renderRedTeapot(0.0, -0.5, -3.0);
- renderRedTeapot(2.0, -0.5, -4.0);
- renderRedTeapot(4.0, -0.5, -5.0);
- glFlush();
-}
-
-static void
-myReshape(int w, int h)
-{
- glViewport(0, 0, w, h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- if (w <= (h * 3))
- glOrtho(-6.0, 6.0, -2.0 * ((GLfloat) h * 3) / (GLfloat) w,
- 2.0 * ((GLfloat) h * 3) / (GLfloat) w, 0.0, 10.0);
- else
- glOrtho(-6.0 * (GLfloat) w / ((GLfloat) h * 3),
- 6.0 * (GLfloat) w / ((GLfloat) h * 3), -2.0, 2.0, 0.0, 10.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-}
-
-static void
-key(unsigned char k, int x, int y)
-{
- switch (k) {
- case 27: /* Escape */
- exit(0);
- break;
- default:
- return;
- }
- glutPostRedisplay();
-}
-
-/* Main Loop
- * Open window with initial window size, title bar,
- * RGBA display mode, depth buffer, and handle input events.
- */
-int
-main(int argc, char **argv)
-{
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
- glutInitWindowSize(450, 150);
- glutCreateWindow(argv[0]);
- myinit();
- glutReshapeFunc(myReshape);
- glutDisplayFunc(display);
- glutCreateMenu(selectFog);
- glutAddMenuEntry("Fog EXP", GL_EXP);
- glutAddMenuEntry("Fog EXP2", GL_EXP2);
- glutAddMenuEntry("Fog LINEAR", GL_LINEAR);
- glutAddMenuEntry("Quit", 0);
- glutAttachMenu(GLUT_RIGHT_BUTTON);
- glutKeyboardFunc(key);
- glutMainLoop();
- return 0; /* ANSI C requires main to return int. */
-}
projects / mesa.git / blobdiff